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Catalytic performance of rhodium supported on ceria–zirconia mixed oxides for reduction of NO by propene

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Abstract.
The catalytic activity of Rh/CeO2–ZrO2 for NO reduction by C3H6 under stoichiometric conditions was
found to depend strongly on the Ce/Zr composition. Rh/CeO2–ZrO2 with a Ce/Zr molar ratio of 50/50
(Rh/CZ-50/50) had the greatest activity; Ce/Zr = 74/26 (Rh/CZ-74/26), the least. The Rh/CZ-50/50 also
showed specifically high intrinsic activity expressed in terms of turnover frequency (TOF). Different
characterization techniques revealed that the Rh and CeO2–ZrO2 support interaction varied according
to Ce/Zr composition, and high TOF on Rh/CZ-50/50 was accounted for by the strong Rh and CeO2–ZrO2
support interaction. Although the Rh/CZ-74/26 catalyst was the least active, it was able to catalyze NO
reduction with C3H6 when O2 was eliminated from the reaction gas. In situ FT-IR spectroscopy suggested
that formate species formed and stabilized on the Rh/CZ-74/26 catalyst poison the catalytically active
sites for NO reduction with C3H6.

Keywords:
NO reduction
Propene
Stoichiometric conditions
Rhodium
Ceria–zirconia mixed oxide
Fourier transform infrared spectroscopy

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Informasi Detail

Judul Seri

Journal of Catalysis

No. Panggil

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Penerbit

London : Elsevier Inc.., 2008

Deskripsi Fisik

Journal of Catalysis 259 (2008) 223–231

Bahasa

English

ISBN/ISSN

00219517

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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